Php header Location returns 200

I am doing an official account Wechat login.
I jump to Wechat"s authorization with the following code: 

header("Location:https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$this->appid."&redirect_uri=".$REDIRECT_URI."&response_type=code&scope=snsapi_userinfo&state=STATE-sharpwechat_redirect");

however, the status code returned by the server is 200.

then I put error_reporting (E_ALL) in front of header;
doesn"t have anything to output either.

then I added a

directly after header. 
header("Location:https://www.baidu.com");

jump directly to Baidu!
what is this situation?
--
I output the contents of header directly and find a mysterious line break! However, there are no newline characters here.

Php thinkphp apache
Sep.18,2021 
  
 look at your screenshot, wrap the appid parameter, and you try to URL the parameter.

Previous: Have you ever encountered a situation in which the whole Mini Program especially stuttered and dropped frames as soon as the number of swiper-item was more?

Next: Mini Program, how does a status change affect a page that has been cut in the background

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3a761-2ba61.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3a761-2ba61.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?